JP6064652B2 - Electric motor, electric blower, and electric vacuum cleaner equipped with this electric blower - Google Patents

Description

  The present invention relates to an electric motor, and more particularly to an electric motor reduced in weight, to an electric blower provided with the electric motor, and further to an electric vacuum cleaner provided with the electric blower.

  Conventionally, in order to fix the stator of the electric motor to the frame constituting the outer periphery of the electric motor, a shrink fitting method or a press fitting method has been used, and a configuration in which compressive force due to the press fitting is dispersed and reduced is known. ing. (For example, refer to Patent Document 1).

JP 2010-183792 A (page 4, FIG. 2)

  In recent years, in response to demands for weight reduction of vacuum cleaners, various measures have also been taken to reduce the weight of electric motors used in electric blowers mounted on vacuum cleaners, and one of them is a frame that forms the outer periphery of the motor. A method using a lightweight material such as an aluminum material is considered.

  Usually, the stator core is made of laminated magnetic steel sheets, and the frame is made of steel sheets, so the thermal expansion coefficient is almost the same, so there is no problem with fixing by shrink fitting or press fitting. It was.

  However, the thermal expansion coefficient differs between the electromagnetic steel sheet stator and the aluminum frame, and the frame has a large coefficient of thermal expansion. Therefore, the motor is driven by a simple shrink-fitting or press-fitting fixing method as in a conventional electric motor. Since the frame expands more than the stator due to the temperature rise due to heat generation, there is a problem that the force with which the frame restrains the stator is reduced.

In addition, since the force with which the frame restrains the stator is reduced, the stator is displaced from its original position due to the reaction force applied in the direction opposite to the rotation direction of the armature that is the rotating body of the motor. There was a problem that the performance of the electric motor deteriorated.

  The present invention has been made in order to solve the above-described problems, and it has been reduced in weight so that the displacement of the stator due to a decrease in the force of restraining the stator of the electromagnetic steel plate by the aluminum frame is suppressed and the performance does not deteriorate. An object is to provide an electric motor, and an object is to provide a lightened vacuum cleaner equipped with an electric blower using the electric motor.

An electric motor according to the present invention for solving the problems includes a cylindrical frame, a stator formed by winding field coils around a rectangular stator core having four corners, and a rotating shaft. An armature core and a commutator provided on the rotating shaft, and an armature formed by connecting the armature winding wound around the armature core and the commutator, and projecting to the inner periphery of the frame Protrusions are provided, and one or more corners of the stator core are provided with recesses. The protrusions and the recesses are fitted or abutted with each other , and the protrusions are parallel to the rotation axis direction of the armature. Provided by cutting and raising, the end face of the convex part is located on a line passing through the center of the armature axis, and the concave part cuts part of the corner of the stator core parallel to the direction of the armature axis. The end surface of the recess is located on a line passing through the center of the armature's rotation axis, The end surface of the face and the recess is one that is in contact engagement or those. Further, an electric motor according to the present invention for solving the problem includes a cylindrical frame, a stator formed by winding a field winding around a stator iron core enclosed in the frame and having four corner portions. An armature having a rotating shaft, an armature core and a commutator provided on the rotating shaft, and an armature winding wound around the armature core and a commutator connected to each other. Protrusions projecting around the periphery, one or more corners of the stator core are provided with recesses, the protrusions and recesses are fitted or abutted, and two or more protrusions and recesses are provided, The end surface of at least one convex part and the end surface of a recessed part fit or contact | abut, and it has a clearance gap between the end surface of another convex part, and the end surface of a recessed part.

  According to the present invention, the convex portion protruding on the inner periphery of the frame is provided, the concave portion is provided in one or more of the corner portions of the stator core, and the convex portion and the concave portion are fitted or in contact with each other. Therefore, even if the frame is made of a material with a high coefficient of thermal expansion and the frame is thermally expanded due to heat generated when the motor is driven, the influence of the reaction force applied in the direction opposite to the rotation direction of the armature that is the rotating body of the motor Therefore, the stator can be prevented from shifting, and the weight of the motor can be reduced while ensuring the performance of the motor.

1 is a partial cross-sectional perspective view showing an electric motor according to Embodiment 1 of the present invention. 1 is a perspective view showing a stator of an electric motor according to Embodiment 1 of the present invention. FIG. 3 is a perspective view showing a stator core of the electric motor according to Embodiment 1 of the present invention. FIG. 3 is a three-side view of the stator core of the electric motor according to Embodiment 1 of the present invention as seen from the plane direction and the side direction. 1 is a perspective view showing an armature of an electric motor according to Embodiment 1 of the present invention. 1 is a perspective view showing an armature core of an electric motor according to Embodiment 1 of the present invention. (A) The perspective view which shows the electric motor which concerns on Embodiment 1 of this invention, (b) It is sectional drawing cut | disconnected by AA shown to Fig.6 (a). (A) The B section enlarged view of AA sectional drawing, (b) The C section enlarged view of AA sectional drawing. FIG. 3 is a plan view showing a magnetic path of a stator core of the electric motor according to Embodiment 1 of the present invention. It is a disassembled perspective view which shows the electric blower which concerns on Embodiment 2 of this invention. It is a fragmentary sectional perspective view which shows the electric blower which concerns on Embodiment 2 of this invention. It is sectional drawing which shows the vacuum cleaner which concerns on Embodiment 3 of this invention.

Embodiment 1 FIG.
(Configuration of electric motor)
1 is a partially sectional perspective view showing an electric motor according to Embodiment 1 of the present invention, FIG. 2 is a perspective view showing a stator of the electric motor according to Embodiment 1 of the present invention, and FIG. 3 is an embodiment of the present invention. 4 is a perspective view showing a stator iron core of the electric motor according to FIG. 1, FIG. 4 is a three-side view showing the stator iron core of the electric motor according to Embodiment 1 of the present invention as seen from the plane direction and the side surface direction, and FIG. FIG. 6 is a perspective view showing the armature core of the electric motor according to the first embodiment of the present invention. FIG. 6 is a perspective view showing the armature of the electric motor according to the first embodiment.

Hereinafter, the configuration of the electric motor according to Embodiment 1 of the present invention will be described with reference to FIGS.
Note that in each drawing, the same reference numerals are given to the same portions or corresponding portions, and a part of the description may be omitted.

  As shown in FIG. 1, reference numeral 100 denotes an electric motor according to Embodiment 1 of the present invention, which is called a commutator electric motor. The electric motor 100 includes a stator 1, an armature 2, and a brush 3.

  The main components of the stator 1 are a stator core 4, an upper insulating member 5, a lower insulating member 6, and a field winding 7. The stator core 4 includes a plurality of thin electromagnetic steel plates (for example, having a plate thickness of about 0.1 to 1.0 mm) punched into the same shape with a mold until a predetermined thickness T is reached as shown in FIG. It is formed by laminating sheets.

  Since the stator core 4 is formed by laminating a plurality of thin electromagnetic steel sheets having the same shape, the upper end width W1 and the lower end width W2, and the upper end width W3 and the lower end width W4 in the heat T direction are W1 = W2 and W3 = W4, respectively. It becomes the same width at the upper end and the lower end.

  As shown in FIGS. 3 and 4, the stator core 4 has a substantially rectangular shape and includes magnetic pole portions 8a and 8b and yoke portions 9a and 9b. The magnetic pole portions 8 a and 8 b have a pair of identical shapes that face each other so as to sandwich a through space 11 provided in the center of the stator core 4. The yoke portions 9a and 9b are connected to both ends of the magnetic pole portions 8a and 8b, respectively.

The stator core 4 has stator slots 10a, 10b, 10c, and 10d. The stator slots 10a, 10b, 10c, and 10d are spaces in which the field windings 7 wound around the stator core 4 through the upper insulating member 5 and the lower insulating member 6 are accommodated. Stator slots 10a, 10b, 10c, and 10d and through space 11 are provided in communication.

Further, the stator core 4 has corner portions 12a, 12b, 12c, and 12d. The corner portions 12a, 12b, 12c and 12d are provided with recesses 13a, 13b, 13c and 13d, respectively.

The stator core 4 is symmetrical with respect to the center line X and the center line Y shown in FIG. Therefore,
The recesses 13a and 13b, the recesses 13c and 13d are line-symmetrical with respect to the center line Y, and the recesses 13a and 13c and the recesses 13b and 13d are line-symmetrical with respect to the center line X.

An intersection D between the center line X and the center line Y is the same as the center of the rotation shaft 14 of the armature 2 described later, and is the rotation center of the armature 2. Since the intersection point D is the same as the center of the rotating shaft 14, it may be described as the shaft center in the subsequent stage.

  The short sides of the notched shapes of the recesses 13a, 13b, 13c, and 13d are processed so as to overlap the extended lines E and F that pass through the center of the rotating shaft 14 of the armature 2, respectively.

  The upper insulating member 5 and the lower insulating member 6 are each formed by resin molding having insulating properties. The field winding 7 is a wire having a predetermined wire diameter having conductivity such as a copper wire.

  Next, the main components of the armature 2 are a rotating shaft 14, an armature core 15, a commutator 16, and an armature winding 17. As shown in FIG. 6, the armature core 15 is circular, has a protruding shape called a tooth 15a on the outer peripheral side, and has a space 15b between adjacent teeth 15a.

  Similarly to the stator core 4, the armature core 15 is also formed by punching out thin electromagnetic steel plates (for example, having a thickness of about 0.1 to 1.0 mm) into the same shape with a mold until a predetermined thickness is reached. Molded by laminating.

  The armature core 15 is fixed to the rotating shaft 14. The armature winding 17 is wound around the armature core 15 so as to be accommodated in the space 15b with an insulating member (not shown) interposed therebetween, and is connected to the commutator 16 fixed to the rotating shaft 14 in the same manner as the armature core 15. Is done. The armature winding 17 is also a wire having a predetermined wire diameter having conductivity like a copper wire, like the field winding 7, although the wire diameter is different.

  As shown in FIG. 1, the stator 1 is fixed to a frame 19 having a cylindrical shape with one end face opened and the other end face having a bottom. The frame 19 is formed of a material that is lighter than a galvanized steel sheet having a specific gravity of 7.87 (equivalent to pure iron), such as an aluminum material having a specific gravity of 2.7 (equivalent to pure aluminum). The

By using the aluminum material, the weight becomes about 30% as compared with a conventional frame formed of a galvanized steel sheet, and the weight of the electric motor 100 can be reduced. Note that an aluminum alloy may be selected in consideration of strength and the like, since the weight can be reduced in the same manner even if an aluminum alloy is used instead of a pure aluminum material.

  The frame 19 is formed by integrally forming a thin aluminum plate into a cylindrical shape having one end surface opened and the other end surface bottomed by a method of deep drawing using a mold. In the case of such deep drawing, in order to easily extract the mold from the inside of the cylinder, an inclination called a draft may be provided so that the opening side becomes wider from the bottomed side.

However, in the electric motor as in the present invention, if the inclination is provided, gaps are generated between the frame 19 and the corner portions 12a, 12b, 12c, and 12d of the stator 1, and the performance of the electric motor is deteriorated by affecting the fixing. there is a possibility. Therefore, the frame 19 is processed without providing a draft angle.

  As shown in FIG. 5, bearings 18 a and 18 b are attached to the rotary shaft 14 of the armature 2. The bearing 18b attached to the commutator 16 side is inserted and fixed in a receiving portion 19b provided on the bottom portion 19a of the frame 19, and the position of the armature 2 in the direction of the rotating shaft 14 is determined.

  The bearing 18 a is inserted and fixed in a holding portion 20 a provided in the fixing member 20, and is attached to the frame 19 with a plurality of screws 21.

  In the armature 2 attached in this way, the outer periphery of the armature core 15 and the magnetic pole portion inner surfaces 8c and 8d located in the through space 11 of the magnetic pole portions 8a and 8b of the stator core 4 face each other with a predetermined space therebetween. It is arranged at the position to do. The armature 2 is rotatable by bearings 18a and 18b.

  The brush 3 is attached to the frame 19 and is in contact with the commutator 16 by a biasing member such as a spring (not shown). A current is supplied from the brush 3 to the commutator 16, and the armature 2 rotates to generate a rotational force of the electric motor 100.

(Fixing structure of the stator 1 to the frame 19)
Next, a structure for fixing the stator 1 to the frame 19 will be described with reference to FIGS. 7A is a perspective view showing the electric motor according to Embodiment 1 of the present invention, FIG. 7B is a cross-sectional view taken along line AA shown in FIG. 6A, and FIG. FIG. 8B is an enlarged view of a C portion of the AA sectional view, and FIG. 9 is a plane showing a magnetic path of the stator core of the electric motor according to the first embodiment of the present invention. FIG. Note that in each drawing, the same reference numerals are given to the same portions or corresponding portions, and a part of the description may be omitted.

  The inner diameter of the cylinder of the frame 19 is set slightly smaller than the outer dimension of the stator 1. First, heating is performed until the inner diameter of the cylinder of the frame 19 expands slightly larger than the outer dimension of the stator 1, and the stator 1 is inserted into a predetermined position in this state.

  When cooled in this state, the frame 19 contracts, and the corners 12a, 12b, 12c, and 12d of the stator core 4 are tightened, whereby the stator 1 is restrained. This is a so-called shrink fitting method. As described above, the stator core 4 has the same width at the upper end and the lower end, and the frame 19 is processed without a draft, so the contact between the frame 19 and the corner portions 12a, 12b, 12c, 12d. It is difficult for gaps to occur in the parts.

  In the situation where the electric motor 100 is not driven, heat is not generated and the temperature does not rise, so that the restraint by shrink fitting does not loosen. However, the aluminum material forming the frame 19 has a thermal expansion coefficient about twice as large as that of the electromagnetic steel sheet forming the stator core 4.

Therefore, when the frame 19 and the stator core 4 are thermally expanded due to a temperature rise due to heat generated by driving the electric motor 100, the frame 19 expands more than the stator core 4 at the same temperature rise, and the constraint is loosened. It becomes easy.

  The rotation of the armature 2 causes the stator 1 to apply a force to rotate in the direction G of the armature 2 and in the direction H receiving the opposite reaction force, as shown in FIG. . When the restraint is loosened, there is a possibility that the stator 1 is displaced due to this force, and the displacement of the stator 1 causes the performance of the electric motor 100 to deteriorate.

Therefore, the electric motor according to Embodiment 1 of the present invention has a structure in which the restraint is not loosened. As shown in FIGS. 7A and 7B, the frame 19 is provided with convex shapes 22a and 22b so as to protrude toward the inner surface of the wall surface of the cylindrical portion.

  The convex shapes 22a and 22b are formed by, for example, a so-called cutting and raising process in which cutting is performed with a die and bending is performed so as to be pushed from the outer surface to the inner surface. However, if a predetermined convex shape can be formed, the processing method is not limited to cutting and raising processing.

  As shown in FIG. 7 (b), the convex shape 22 a is processed so that the leading end surface of the raised portion overlaps with the extension line E passing through the center of the rotating shaft 14 of the armature 2. As described above (see paragraph 0021), the short sides of the notches of the recesses 13a, 13b, 13c, and 13d provided in the stator core 4 of the stator 1 are also centered on the rotation shaft 14 of the armature 2, respectively. It is processed so as to be in a position overlapping with the extended lines E and F that pass therethrough.

Therefore, as shown in FIG. 8A, the leading end surface of the raised shape 22a and the short side of the notched shape of the recessed portion 13a provided in the stator core 4 of the stator 1 are fitted or brought into contact with each other. It has become.

  The recesses 13a and 13d are provided on the side where the armature 2 is rotated, and the recesses 13b and 13c are provided on the rotation sending side. As shown in FIGS. 7B and 8A, with respect to the direction H in which the stator 1 receives the reaction force, the leading end surface of the raised shape 22a and the recess 13a The short side of the notch is fitted or abutted.

Therefore, the stator 1 can be restrained at a predetermined position without being displaced, and even if a lightweight aluminum material having a high coefficient of thermal expansion is used for the frame 19, the weight of the motor 100 can be reduced without deteriorating.

Further, in the case of expansion due to a temperature rise due to heat, it is difficult to expand in the circumferential direction and expands from the center of the rotating shaft 14 to the outside. Expands outward on E.

Therefore, it is difficult for a gap to be formed between the cut-and-raised tip end surface of the convex shape 22 a and the short-side side of the notched shape of the concave portion 13 a provided in the stator core 4 of the stator 1. Therefore, since the stator 1 can be restrained at a predetermined position without being displaced, the weight of the motor 100 can be reduced without deteriorating the performance of the electric motor 100 even if a lightweight aluminum material having a high coefficient of thermal expansion is used for the frame 19.

  As shown in FIG. 8B, the leading end surface of the raised shape 22b is not provided at a position overlapping with the extension line F passing through the center of the rotating shaft 14, and the short side of the notched shape of the recessed portion 13b is provided. A predetermined gap J is provided apart from the side.

This takes into account variations in processing and manufacturing of the frame 19 and the stator 1 and variations in processing of inserting the frame 19 into the stator 1. Since the cut-and-raised tip end surface of the convex shape 22a and the short-side side of the cut-out shape of the concave portion 13a are always fitted or abutted, the front-end surface of the cut-out shape of the convex shape 22b is the short-side of the cut-out shape of the concave portion 13b. By providing it at a distance from the side, the degree of freedom in inserting the stator 1 into the frame 19 is ensured.

  As described above, the stator core 4 of the stator 1 is symmetrical with respect to the center line X and the center line Y (see FIG. 4), so that the recesses 13a and 13b and the recesses 13c and 13d are line symmetric with respect to the center line Y. The concave portions 13a and 13c and the concave portions 13b and 13d are line-symmetrical with respect to the center line X.

In other words this recess 13a and 13d, the recess 13b and 13c has a point symmetry with the axis center D of rotation shaft 14. Therefore, since the recess 13d has the same shape as the recess 13a even when rotated 180 degrees, the leading end surface of the raised shape 22a and the short side of the notched shape of the recess 13d are fitted or abutted as in the case of the recess 13a. It becomes.

  Since the recesses 13a, 13b, 13c, and 13d are provided in this way, the direction of the stator core 4 can be given freedom when the stator 1 is assembled and assembled. Will improve.

(Description of recess notch shape)
The recesses 13a, 13b, 13c, and 13d provided in the stator core 4 are formed by notching in consideration of the width of the magnetic path so as not to hinder the flow of magnetic flux of the stator core 4. The magnetic path is a path through which the magnetic flux flows, and if the flow of the magnetic flux is obstructed, the performance of the electric motor 100 is greatly deteriorated.

  As an example, the magnetic flux flows as shown by an arrow K as shown in FIG. The yoke portion 9a continuous with the corner portion 12a is formed with predetermined magnetic path widths W5 and W6, and has a relationship of W5 = W6. The recess 13a provided in the corner portion 12a is formed in accordance with the relationship of W5 ≦ W7 and W6 ≦ W7 so that the magnetic path width W7 does not become equal to or smaller than the magnetic path widths W5 and W6.

Therefore, since the magnetic path width is not narrowed by the yoke portion 9a and the corner portion 12a, the performance of the electric motor 100 is ensured without hindering the flow of magnetic flux. The relationship between the other corner portions 12b, 12c, 12d and the recesses 13b, 13c, 13d is also set similarly.

  As described above, the raised cut-out and the cut-out shape of the recess provided in the stator core of the stator are fitted or brought into contact with each other, so that the stator is restrained to a predetermined position without being displaced. Even if a lightweight aluminum material having a large coefficient of thermal expansion is used for the frame, the weight can be reduced without degrading the performance of the electric motor.

Also, the convex shape overlaps with the extension line passing through the center of rotation of the armature, and the notch shape of the recess provided in the stator core is processed into the position overlapping with the extension line passing through the center of rotation of the armature. Since the notch shape of the concave portion provided in the stator core of the stator and the raised cut-out of the stator is fitted or abutted, the stator can be restrained to a predetermined position without being displaced, Even if an aluminum material that is lightweight and has a high coefficient of thermal expansion is used for the frame, the weight can be reduced without degrading the performance of the motor.

Then, the notch shape of one convex shape and the notch shape of the concave portion provided in the stator core of the stator are fitted or abutted, and the notch shape of the other convex shape and the concave shape has a gap. Since they are provided apart from each other, the degree of freedom in inserting the stator into the frame can be secured, and the assemblability is improved.

Further, since the concave portions of the stator core are provided symmetrically about the center line or point-symmetrically about the rotation axis, it is not possible to assemble the stator core by rotating it 180 degrees when assembling the stator 1. As a result, assembly of the stator is improved.

Moreover, since the width of the yoke portion and the width of the concave portion of the corner portion are not less than the same width so as not to disturb the magnetic flux flow of the stator core, the magnetic path width is not narrowed and the magnetic flux flow is obstructed. The performance of the electric motor can be ensured without any problems.

In the embodiment of the present invention, the convex shape provided on the frame 19 is two of 22a and 22b, 22a1 abuts and 22b is separated, but the point is symmetrical with respect to the axial center D of the rotating shaft 14. Each may have a convex shape that is the same shape as 22a and 22b.

Recesses 13a and 13d in the stator core 4 in the axial center D of rotation shaft 14, since the recess 13b and 13c are provided at each point symmetry, symmetrical convex and concave 13d point convex 22a is fitted Alternatively, they come into contact with each other, and the point-symmetric convex shape of the convex shape 22b and the concave portion 13c are provided apart from each other with a predetermined gap.

Therefore, the convex shape 22a and the concave portion 13a, 22a are in a point symmetrical position and the concave portion 13d are fitted or abutted, and the convex shape 22b and the concave portion 13b, 22b are in a point symmetrical position and the concave portion 13c are separated. .

As a result, as in the case of the two convex shapes 22a and 22b, the stator can be restrained to a predetermined position without shifting, and the performance of the motor is lowered even if a lightweight aluminum material having a high coefficient of thermal expansion is used for the frame. The weight can be reduced without any problem, and the degree of freedom in inserting the stator into the frame can be secured and the assembly can be improved.

Embodiment 2. FIG.
(Configuration of electric blower)
FIG. 10 is an exploded perspective view showing an electric blower according to Embodiment 2 of the present invention, and FIG. 11 is a partial sectional perspective view showing the electric blower according to Embodiment 2 of the present invention.
Hereinafter, the configuration of the electric blower according to Embodiment 2 of the present invention will be described with reference to FIGS. 10 and 11.

  As shown in FIG. 10, reference numeral 200 denotes an electric blower according to the second embodiment of the present invention, which includes the electric motor 100, the rectifying blade 56, the blower fan 55, and the fan cover 54 according to the first embodiment of the present invention.

  The blower fan 55 generates suction air from the electric blower 200. The rectifying blade 56 is a guide vane that performs pressure recovery of the suction air generated by the blower fan 55 and guides the air into the electric motor. The fan cover 54 is for preventing the suction air from diverging.

  As shown in FIG. 11, the rectifying blade 56 is attached to the electric motor 100, and the blower fan 55 is fixed to the rotating shaft 14 of the electric motor 100 with a nut 57. Then, the fan cover 54 is press-fitted into the frame 19 of the electric motor 100.

(Operation of electric blower)
When the electric blower 200 assembled in this way is driven, the blower fan 55 is rotated by the electric motor 100, whereby the suction air L is sucked from the air inlet 54 a provided in the fan cover 54. The suction air L is exhausted like M from an exhaust port 58 provided in the electric motor 100.

  As described above, since the motor is reduced in weight without reducing the performance of the electric motor by using the aluminum material for the frame, the electric blower can be reduced in weight.

Embodiment 3 FIG.
(Configuration of vacuum cleaner)
FIG. 12 is a cross-sectional view showing a vacuum cleaner according to Embodiment 3 of the present invention.
Hereinafter, the configuration of the electric vacuum cleaner according to Embodiment 3 of the present invention will be described with reference to FIG.

  As shown in FIG. 12, reference numeral 300 denotes a vacuum cleaner according to the third embodiment of the present invention. In the main body 70, a dust collecting container 71, a control board 72, and an electric blower 200 according to the second embodiment of the present invention are shown. Do not have a power cord cord reel.

Although not shown, a hose body for sucking dust composed of a suction tool, a soft tube portion, and a hard tube portion is inserted into the hose body insertion port 76.

  The dust collection container 71 is for accumulating the sucked dust, and there are a type using a dust collection bag and a type not using a dust collection bag such as a cyclone type. Embodiment 3 of the present invention Any of these vacuum cleaners 300 may be used, and the electric blower of the present invention can be mounted without being limited to the type of the dust collecting container.

  The control board 72 controls driving of the electric blower 200 in order to suck dust by operating an operation unit (not shown).

  Wheels 73 are provided on the side surface of the main body 70, and casters 74 are provided on the lower surface. The main body 70 can be routed by the wheels 73 and the casters 74. The handle 75 is for carrying the main body 70.

(Operation of vacuum cleaner)
When the electric blower 200 included in the electric vacuum cleaner 300 as described above is driven, suction air is generated by the electric blower 200 as described in the second embodiment, and suction of air containing dust is performed by a hose body (not shown). It can be performed. The air containing the sucked dust is separated into dust and air by the dust collecting container 71 and the dust is collected, and the air from which the dust has been removed is discharged out of the main body 70 via the electric blower 200.

  As described above, since the electric blower having the motor reduced in weight without reducing the performance of the electric motor using the aluminum material for the frame is provided, the electric vacuum cleaner can be reduced in weight.

  DESCRIPTION OF SYMBOLS 1 Stator, 2 Armature, 3 Brush, 4 Stator core, 5 Upper insulating member, 6 Lower insulating member, 7 Field winding, 8a Magnetic pole part, 8b Magnetic pole part, 8c Magnetic pole part inner surface, 8d Magnetic pole part inner surface, 9a yoke part, 9b yoke part, 10a stator slot, 10b stator slot, 10c stator slot, 10d stator slot, 11 through space, 12a corner part, 12b corner part, 12c corner part, 12d corner part, 13a recess (notch shape), 13b recess (notch shape), 13c recess (notch shape), 13d recess (notch shape), 14 rotating shaft, 15 armature core, 15a teeth, 15b space, 16 commutator 17 Armature winding, 18a bearing, 18b bearing, 19 frame, 19a bottom part, 19b receiving part, 20 fixing member, 20 a holding part, 21 screw, 22a convex shape, 22b convex shape, 23 tip surface, 54 fan cover, 54a intake port, 55 blower fan, 56 rectifier blade, 57 nut, 58 exhaust port, 70 body, 71 dust collecting container, 72 control board, 73 wheels, 74 casters, 75 handle, 76 hose body insertion port, 100 electric motor, 200 electric blower, 300 vacuum cleaner, D intersection (axis center), E extension line, F extension line, G armature 2 Rotation direction, H direction in which the stator 1 receives the reaction force, J predetermined gap, K arrow, L suction air, M exhaust, T stator core 4 thickness, W1 stator core 4 width, W2 stator core 4, width of W3 stator core 4, width of W4 stator core 4, W5 magnetic path width, W6 magnetic path width, W7 magnetic path width, X center line, Y center line.

Claims (10)

A cylindrical frame;
A stator formed by winding a field winding around a rectangular stator iron core enclosed in the frame and having four corners;
An armature having an axis of rotation, an armature core and a commutator provided on the axis of rotation, and an armature formed by connecting the armature winding wound around the armature core and the commutator;
Providing a projecting portion projecting on the inner periphery of the frame, providing a recess in one or more of the corner portions of the stator core, the projecting portion and the recess fit or abut ,
The convex portion is provided by cutting and raising the frame in parallel with the rotation axis direction of the armature, and the end surface of the convex portion is located on a line passing through the rotation axis center of the armature,
The recess is provided by cutting out a part of the corner portion of the stator core in parallel with the rotation axis direction of the armature, and the end surface of the recess is positioned on a line passing through the rotation axis center of the armature. And
An electric motor characterized in that an end surface of the convex portion and an end surface of the concave portion are fitted or in contact with each other. A cylindrical frame;
A stator formed by winding a field winding around a rectangular stator iron core enclosed in the frame and having four corners;
An armature having an axis of rotation, an armature core and a commutator provided on the axis of rotation, and an armature formed by connecting the armature winding wound around the armature core and the commutator;
Providing a projecting portion projecting on the inner periphery of the frame, providing a recess in one or more of the corner portions of the stator core, the projecting portion and the recess fit or abut ,
Two or more of each of the convex portions and the concave portions are provided, the end surface of at least one of the convex portions and the end surface of the concave portion are fitted or abutted, and a gap is provided between the end surface of the other convex portion and the end surface of the concave portion. An electric motor comprising:   The concave portion is provided so as to cut out a part of the corner portion of the stator core that faces the rotation of the armature, and the end surface of the convex portion and the end surface of the concave portion are fitted or in contact with each other. The electric motor according to claim 1, wherein the electric motor is provided.   4. The method according to claim 1, wherein two or more of the convex portions and the concave portions are provided, and an end surface of at least one of the convex portions and an end surface of the concave portion are fitted or in contact with each other. The electric motor described in one. Provided said recess and said protrusion such that equal an even number, respectively, in any one of claims 1 to 4, characterized in that it is arranged point symmetrically round guinea center of the armature The electric motor described. The width of the part which provided the recessed part in the said corner part of the said stator iron core is more than the width of the yoke part of the said stator core continuous with the said corner part, The Claim 1 characterized by the above-mentioned. Item 6. The electric motor according to any one of Items 5 . The motor according to any one of claims 1 to 6 , wherein a material of the frame is a material having a higher coefficient of thermal expansion than a material of the stator core. The motor according to any one of claims 1 to 7 , wherein a material of the frame is an aluminum material or an aluminum alloy. An electric motor according to any one of claims 1 to 8 ,
A centrifugal fan provided on a rotating shaft of the electric motor;
An electric blower characterized by comprising: An electric vacuum cleaner comprising the electric blower according to claim 9 .

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